2019
DOI: 10.3390/ani9100837
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Comparison of Methods to Measure Methane for Use in Genetic Evaluation of Dairy Cattle

Abstract: Simple SummaryMethane is a greenhouse gas with a global warming potential 28 times that of CO2. Enteric methane accounts for 17% of global methane emissions and 3.3% of total global greenhouse gas emissions from human activities. There is, therefore, significant research interest in finding ways to reduce enteric methane emissions by ruminants. Partners in Expert Working Group 2 (WG2) of the European Cooperation in Science and Technology (COST) Action METHAGENE have used several methods for measuring methane o… Show more

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Cited by 79 publications
(88 citation statements)
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“…Open-circuit RC has replaced the earlier closed-circuit RC previously used by Blaxter and Clapperton [ 37 ], providing a relatively simple and accurate way of measuring the heat exchange of animals held within them. Moreover, there are optional sensors for detecting temperature, humidity and pressure installed in some RCs for environmental monitoring [ 38 ]. The size of RCs varies according to the species of animals they are intended to be used with.…”
Section: Measurement Techniquesmentioning
confidence: 99%
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“…Open-circuit RC has replaced the earlier closed-circuit RC previously used by Blaxter and Clapperton [ 37 ], providing a relatively simple and accurate way of measuring the heat exchange of animals held within them. Moreover, there are optional sensors for detecting temperature, humidity and pressure installed in some RCs for environmental monitoring [ 38 ]. The size of RCs varies according to the species of animals they are intended to be used with.…”
Section: Measurement Techniquesmentioning
confidence: 99%
“…Furthermore, animals require training and acclimatization to withstand enclosure in RCs before being assessed, which requires high labor input and time cost. A greater concern is that measurements of CH 4 production are made under artificial conditions on animals that are restricted in their movements [ 31 , 38 ]. CH 4 emissions and feed intake values gathered under such artificial conditions may not reliably reflect those from the same animal actively grazing a pasture under highly variable environmental conditions (e.g., temperature fluctuations, wind chill, sporadic or heavy levels of rainfall and an uneven distribution of vegetation), [ 46 ] and the maximum intakes for animals are generally lower in RC than in grazing because of the restriction of animal movements [ 36 , 47 ].…”
Section: Measurement Techniquesmentioning
confidence: 99%
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“…Moreover, respiration chamber environment and management are very different from those of commercial dairy farms. Predictions of EME at the farm level using detectors placed within automatic milking or feeder systems to analyze air methane and carbon dioxide concentrations is also problematic: they do not measure the daily volume of methane emitted and, despite having been proposed as a method for selecting dairy cows [ 5 ], they have shown a low reproducibility and correlation with respiration chambers and other methods [ 6 , 7 , 8 ], opening a wide debate in the scientific community [ 9 , 10 , 11 ].…”
Section: Introductionmentioning
confidence: 99%